N-Acetyl gemifloxacin is a metabolite of gemifloxacin. Gemifloxacin mesylate (trade name Factive, Oscient Pharmaceuticals) is an oral broad-spectrum quinolone antibacterial agent used in the treatment of acute bacterial exacerbation of chronic bronchitis and mild-to-moderate pneumonia. Oscient Pharmaceuticals has licensed the active ingredient from LG Life Sciences of Korea. (Wikipedia)